How is music useful to us as it is a learning and teaching tool adjusting our mood and giving us a healthy life?
This is for my essay. So for the introduction, can you give an example of how it should be?
I think that you might need to engage in some reflection here. Personal reflection about how you perceive music in the learning process would be a good starting point. I might also investigate the teachings and ideas of Howard Gardener, who argues that there are different intelligences within students and teachers need to try to evoke these valences from their pupils in their instruction. Within this analysis, you will find many examples of how music can be used as a learning and teaching tool. He will also go beyond the idea of simply playing music in the background while students work, something he believes is similar to letting an appliance run in the background. I think that investigating Gardener's multiple intelligences, in particular the musical intelligence, will help out tremendously in writing this paper.
Something else that you may want to consider is genre of music. Listening to some types of music may be more "healthy" to listen to than other types of music. For example, listening to classical music may be more relaxing than listening to heavy metal music. Perhaps it has an impact on blood pressure, stress levels, etc. Certain types of music may also trigger aggression so this is something else that you will need to research. You will want to consider and research what happens to a persons body when they are exposed to different types of music.
We cannot write paragraphs or essays for you. Your original directions seemed to ask for this introduction to be put together for you. Your set-up of a general statement about music, then something more specific leading to a thesis is perfect.
So you need to think about how music has been useful to teaching and learning. When has this occured for real in the classroom experiences you have had? What classes? What types of music are more effective than others in your experience? Can music be distracting to some students and not others? What were you doing when music was helpful - counting, writing, reading, learning about an era in history?
You might want to consider researching music's ability to improve health and wellness. I believe there are statistics out there. Maybe try "music and quality of life".
It is popular today in the field of medicine for experts to use something called music therapy. This might be a topic worth searching to help you discover your own words to write your essay.